Public water system · NH0142010

Active

Locke Lake

At a glance

Locke Lake (PWSID NH0142010) is an active community water system in Belknap County, New Hampshire. It reports serving 2,308 people through 923 service connections. Its primary water source is surface water, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in April 2018.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

2,308

Service connections

923

Primary source

Surface water

System type

CWS

Community water system

System record

PWSIDNH0142010

System typeCommunity water system

Activity statusActive

Population served2,308

Service connections923

Primary water sourceSurface water

Owner typePrivate

Primacy agencyNH state drinking water program

City servedBarnstead

StateNew Hampshire

ZIP—

CountyBelknap County

How does Locke Lake compare with other water systems in Belknap County?

By EPA's size categories, Locke Lake is a small system (501 to 3,300 people). Belknap County has 255 active public water systems, and Locke Lake is the 3rd-largest of them by population served. Its population served is about 8.3 times the county average of 278 people per system, and accounts for 3.3% of the 70,916 people reported by systems filed under the county. Across New Hampshire, the 2,450 active systems average 508 people each. Nationally, the average active community water system reports serving 6,703 people, so Locke Lake is about 66% below that figure.

What does “community water system” mean?

A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. New Hampshire has 706 active community water systems, 29% of the state's 2,450 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 39 New Hampshire systems (1.6%) list surface water as their primary source.

Who owns and regulates Locke Lake?

EPA lists Locke Lake as privately owned. The NH state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 232 of the 255 active systems in Belknap County (91%) are also privately owned.

Does Locke Lake have drinking water violations?

Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in April 2018. The violations listed here began between February 1995 and April 2018. By type: 7 contaminant level above the legal limit and 5 monitoring and reporting. The contaminant or rule involved most often is Arsenic (5 of them). EPA lists 10 as resolved and 2 as archived. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.

Began	Violation	Contaminant or rule	Health-based	Status
2018-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2018-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2012-08-08	Monitoring and reportingMonitoring, Source Water (GWR) · code 34	E. colicode 3014	No	Resolved
2012-08-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2012-03-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2010-07-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
2007-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2007-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2007-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2006-02-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1996-04-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Archived
1995-02-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Archived

The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.

Locke Lake: frequently asked questions

Who runs Locke Lake?

Locke Lake (PWSID NH0142010) is a community water system privately owned. It is regulated by the NH state drinking water program.

How many people does Locke Lake serve?

Locke Lake reports serving 2,308 people through 923 service connections in Belknap County, New Hampshire.

Where does Locke Lake get its water?

EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.

Does Locke Lake have any drinking water violations?

Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in April 2018. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.

Is Locke Lake's water safe to drink?

AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in April 2018. For current results, consult the system's annual water quality report, EPA ECHO, or the NH state drinking water program.

Where can I find Locke Lake's water quality report?

As a community water system, Locke Lake must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.

Other water systems in Belknap County

Water system	County	Population served	Type	Source
Laconia Water Works	Belknap	17,125	Community	Surface water
Meredith Water Dept	Belknap	3,750	Community	Surface water
Alton Water Works	Belknap	1,800	Community	Groundwater
Belmont Water Dept	Belknap	1,612	Community	Groundwater
Gunstock Acres Village Dist	Belknap	1,440	Community	Groundwater
Sawyers Dairy Bar	Belknap	999	Transient non-community	Groundwater

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About this data

Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.

Cite as: AquaCensus, “Locke Lake, PWSID NH0142010, New Hampshire”, https://aquacensus.com/water-systems/new-hampshire/locke-lake-nh0142010 (data as of October 1, 2026).